Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Net income
Pre-Tax Amount	$ 245.5	$ 318.2	$ 896.7	$ (973.1)
Tax (Expense) Benefit	(65.3)	(111.9)	(400.6)	186.3
Net income (loss)	180.2	206.3	496.1	(786.8)
Unrealized derivative adjustments
Pre-Tax Amount	4.1	0.0	(1.7)	0.0
Tax (Expense) Benefit	(1.6)	0.0	0.6	0.0
After-Tax Amount	2.5	0.0	(1.1)	0.0
Reclassification for derivative adjustments included in net income
Pre-Tax Amount	(0.2)	(2.1)	(0.2)	(2.1)
Tax (Expense) Benefit	0.1	0.8	0.1	0.8
After-Tax Amount	(0.1)	(1.3)	(0.1)	(1.3)
Unrealized gains (losses) on available-for-sale securities
Pre-Tax Amount	0.2	(0.1)	0.6	0.0
Tax (Expense) Benefit	(0.1)	0.0	(0.2)	0.0
After-Tax Amount	0.1	(0.1)	0.4	0.0
Unrealized currency translation gains (losses)
Pre-Tax Amount	15.7	(18.0)	(10.3)	(74.0)
Tax (Expense) Benefit	0.0	0.0	0.2	0.0
After-Tax Amount	15.7	(18.0)	(10.1)	(74.0)
Reclassification for currency translation losses included in net income
Pre-Tax Amount	0.0	73.4	0.0	73.4
Tax (Expense) Benefit	0.0	0.0	0.0	0.0
After-Tax Amount	0.0	73.4	0.0	73.4
Unrealized pension and post-employment benefit obligations
Pre-Tax Amount	62.2	0.4	126.9	7.1
Tax (Expense) Benefit	(23.8)	(0.1)	(49.3)	(1.8)
After-Tax Amount	38.4	0.3	77.6	5.3
Reclassification for pension and post-employment benefit obligations included in net income
Pre-Tax Amount	13.0	(10.9)	11.2	(13.5)
Tax (Expense) Benefit	(5.0)	3.4	(4.3)	4.4
After-Tax Amount	8.0	(7.5)	6.9	(9.1)
Comprehensive income (loss)
Pre-Tax Amount	340.5	360.9	1,023.2	(982.2)
Tax (Expense) Benefit	(95.7)	(107.8)	(453.5)	189.7
After-Tax Amount	244.8	253.1	569.7	(792.5)
Comprehensive income attributable to noncontrolling interests
Pre-Tax Amount	3.0	(0.3)	9.0	2.3
Tax (Expense) Benefit	(0.3)	(0.2)	(0.5)	(0.7)
After-Tax Amount	2.7	(0.5)	8.5	1.6
Comprehensive income (loss) attributable to Conagra Brands, Inc.
Pre-Tax Amount	337.5	361.2	1,014.2	(984.5)
Tax (Expense) Benefit	(95.4)	(107.6)	(453.0)	190.4
After-Tax Amount	$ 242.1	$ 253.6	$ 561.2	$ (794.1)